Question

A jellyfish can propel itself with jets of water pushed out of its
bell, a flexible structure on top of its body. The elastic bell and
the water it contains function as a mass-spring system, greatly
increasing efficiency. Normally, the jellyfish emits one jet right
after the other, but we can get some insight into the jet system by
looking at a single jet thrust. Figure shows a graph of the motion
of one point in the wall of the bell for such a single jet; this is
the pattern of a damped oscillation. The spring constant for the
bell can be estimated to be 1.2 N/m.